Hi,
here are the minutes of today's meeting
-Status calibration and recrunch (MK)
+v3.4.18 complete for 2004 deuterium 7002-12143, new geom+field
+now working on timing for 2004 hydrogen 12144-13278 and
2005 deuterium 13279-16506
-Status spin angle (CC, CZ)
+ed elastic: theta_e changed little, by ~0.1 degrees, acc. to Chi
-> Take average of all measurements to define best profile
(Doug will provide parametrization of the average of all maps)
-> Shift this profile such that it becomes consistent with ed,ep
(to be done by Chi and Chris)
-> Use "corrected profile" in all analyses
-Mascarad issues (CC,VZ,CZ)
+Goal was to use Mascarad to determine average momentum shifts due to
Blast resolution convoluted with radiative yield
+tml wrongly filled for radiated events?
related to ntuple filling priority/lrn (fixed by CC)
+Chi's concerned how appropriate the use of Mascarad is for kincorr.
Issue of "realistic" resolution introduces uncertainty for the
average shift of the radiated W, questioning strategy
+Question is, by how much does the average momentum shift due to
radiation convoluted with Blast resolution
+CC's presentation
-generates W-spectrum from data, corrected for total kinematic
corrections
-generates unradiated+radiated yield with Mascarad
-convolutes Mascarad yield with a parametrized Blast resolution
function, determines resolution parameters from fit to corrected data
-Convoluting Mascarad-yield with resulting resolution function centered
at proton mass results in a distribution that is shifted by ~1MeV. The
resolution parameter sigma was ~24 MeV
-> Concluding, there is no big radiative shift of the centroid!
+CC is going to explain this more appropriately than I can, in a
separate email.
+three times more yield for "delta" in DGen compared to Mascarad fortran
code
+Reconstructed unradiated events (with cut on delta-peak) gives a
distribution that is shifted by ~10 MeV. Using Adrian's MC file. Unclear
to what extent old calibration/geometery may explain this. Differs from
Eugene's findings back in March.
-Rehearsal talk on GEn at APS/Dallas (EG)
+Dallas.ppt
Best regards
Michael
+-------------------------------------+--------------------------+
| Office: | Home: |
|-------------------------------------|--------------------------|
| Dr. Michael Kohl | Michael Kohl |
| Laboratory for Nuclear Science | 5 Ibbetson Street |
| MIT-Bates Linear Accelerator Center | Somerville, MA 02143 |
| Middleton, MA 01949 | U.S.A. |
| U.S.A. | |
| - - - - - - - - - - - - | - - - - - - - - -|
| Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
| Work: +1-617-253-9207 | Home: +1-617-629-3147 |
| Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
| http://blast.lns.mit.edu | |
+-------------------------------------+--------------------------+
This archive was generated by hypermail 2.1.2 : Mon Feb 24 2014 - 14:07:33 EST